Letter opener



FIG. 1 is a front elevational view of a letter opener showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a side elevational view as seen from the left of FIG. 1; and,

FIG. 6 is a side elevational view as seen from the right side of FIG. 1. 

The ornamental design for a letter opener, as shown and described. 